[exim] Don't add received header for scanned mails

Etusivu
SäieLähettäjäPäiväys ()
M+\Matthias Rieber
||MJeremy Harris
||MMatthias Rieber
||MWolfgang Breyha
||MMatthias Rieber
||MWolfgang Breyha
|M\Heiko Schlichting
M||Heiko Schlittermann
||MHeiko Schlittermann
|MMatthias Rieber
MJeremy Harris